Entering the sacred building from the main west-facing portal, which William II of Hauteville dedicated to the Nativity of the Blessed Virgin Mary, is an invitation to participate in the most impenetrable expression of the infinite, through a pathway steeped in art that calls at the same time for profound veneration. The spicy scent of incense spreads from the sacred area of the Sanctuary, reaching the hall in a crescendo.
Built in the shape of a Latin cross, the basilica develops longitudinally, starting from the three aisles that divide the central body with nine rows of columns. Closing your eyes, following the outline of the columns, rhythmically arranged on each side of the central aisle, and touching the cold marble, is a way to mystically connect with the antiquity. The eighteen columns support capitals, irregularly distributed according to the size of the shaft, which in turn are topped by pulvinos that establish the beginning of the mosaic ornamentation of the walls, in an increasingly intense decorative rhythm.
Sparkling and precious, the entire mosaic mantle of the interior was created by Byzantine craftsmen and local artists over a rather long period of time, between about 1177 and 1183. It follows a precise theological-dogmatic logic, starting from the mosaics of the main aisle, in which scenes from the Creation to the Jacob cycle from the Old Testament stand out, to the episodes of the Life of Christ, visible in the side aisles and described in the New Testament. In this initial path, in which visitors are filled with an arcane and inexpressible feeling, one’s attention naturally focuses on the grandiose image of Christ Pantocrator in the apse, in eloquent harmony with the architecture as a whole.